Reviewed By Martin P (McAllen, TX) Reviewed for a 1994 GMC C/K 1500 —1/3/2011 8:45 AM
its an awsome sound.when it starts to whistle you just dont want it to stop well thats just from my point of view.
Reviewed By Dave S (Browntown, WI) Reviewed for a 2000 GMC C/K 1500 —8/29/2013 11:04 AM
I have a 2000 GMC sierra with a 5.3 and thought I would give this a try. The installation is very well documented and it took about half an hour. It's a very simple concept but I haven't driven it enough to have any real honest results as to its claims of better performance.